Harry v



H. V. HAGHT.

HAMMER DRILL.

APPLICATION FILED MAY 5, 1919.

PatntedSept. '20, 1921.

/I/I/EI/ro TUR/ver vUNITED STATES `Paiiiizai orrica.

HARRY V. HAIGHT, OF SHERBROOKE, QUEBEC, CALTADA, ASSIGNOR TO INGERSOLL- RAND COMPANY, OF JERSEY CITY, NEIV JERSEY, A CORPORATION OF NEW JERSEY.

HAMMER-DRILL.

Specification of Letters Patent.

Patented Sept. 20, 1921.

Application filed May 5, 1919. serial No. 294,740.

T 0 all whom t may concern:

Be it known that I, HARRY V. HAIGHT, a subject of the King of Great Britain, residing at Sherbrooke, in the Provincey of Quebec, Dominion of Canada, have invented certain new and useful Improvement in Hammer-Drills, of which the following is a specification. V

This inventionrelates to a stoper or other percussive tool adapted to drill rock, an'l especially for drilling rock while in inverted position. Particularly the invention relates to a percussive drill provided with a tube through which water may be supplied to the drill steel to aid in removing cuttings from the hole, keep the drill bit at a low temperature and to prevent the formation of ust. v

In stopers and other percussive tools of this general type, in which the drill steel is rotated simultaneously lto being struck by means of a hammer while in inverted position the cuttings fall from the holebeing drilled directly upon the forward end of the tool in which theV drill steel is secured, and in many instances find their way into the bushing inclosing the drill steel and even into the hammer cylinder itself. It is therefore an object of the present invention to provide means to prevent the .cuttings and water from entering the parts of the drill or stoper while it is in operation.

With these and other objects in view, I have devised Vthe construction an embodiment of which is represented on the accompanying drawings and described in the following specification.`

In the drawings annexed hereto andforming a part of the present specification:

Figure 1 shows a longitudinal section through the drill or stoper. v

2 a cross sectional view of a part of the forward portion of drill taken on the line 2 2 of Fig. a.

Fig. 3 shows a front view of the forward portion of drill showing the present invention.

Referring more particularly to the figures of the drawing 1 refers to the cylinder of a drill or stoper in which operates a piston or hammer 2 inthe usual manner. This is provided with flutes 3 and 4, the flutes 3 at the forward end being straight and engaging a chuck 5 in which is held the drill steel 6. At the rear end of the hammer 2 the flutes are helical and engagea rotating ratchet mechanism shown generally at 7. By means of this construction the piston or hammer .2 and consequently the drill steel 6 are rotated. This form of rotation is well known and, as it forms no part of the present invention, is not thought to require a more extended explanation. Y

The fluid used, which is usually com pressed air is admitted to the drill at any convenient point and distributed to the feed cylinder S and to the pressure areas of the cylinder 1 by means of throttle valve 9 and regulating valve 10. The fluid distributing means may be of vany suitable type and forms no part of the present invention, it being suflicient to state that the drill steel is held up to its work in inverted position by means of pressure exerted in the cylinder 8 and the hammer or piston 2, rapidly reciprocated within the cylinder of the drill, strikes an anvil block 11 through which the blow is applied to the drill steel 6.

The cylinder of the drill'is provided with an exhaust outlet 12 at a point near its center in addition to the usual central exhaust opening (not shown) to exhaust a portion of the motive fluid from the cylinder at either end of thel stroke of the piston 2, thereinainder of the uid passing out through the central exhaust opening` in the usual manner. Y

Extending from the exhaust port 12 is a conduit 13, which extends through the front head to the forward end of the tool. At the extreme forward end of the tool, conduit 13 is turned inwardly at an angle and is provided with a. deflector 14 which may extend Vthroughout a Vconsiderable portion of the circumference of the frontend of the tool. y This deflector 111- is normal t0 the longitudinal axis of the tool and serves to direct a jet or blast of motive fluid that has been used in the cylinder 1 directly across the front end of tool and causes it to directly impinge against the sides of the drill steel 6.v Y

At 15 is shown the tube extending through the piston and forwardly to the drill steel 6 through which water may be supplied from a suitable source to the bore 16 provided in the drill steel 6. This tube 15 extends a short distance into drill steel 6 in the usual way and delivers a stream of wa- "ter which is forced by air pressure to the dellector 14 are more clearly shown.v For convenience instead of one large conduit 13, two or more may be provided, two being shownin Fig. 3 and the deflector which may be arc shaped extends throughout a large part of the circumference of the front end and is open at a point diametrically oppo` site the conduit 13, this however being but one form shown as an illustration of the present invention. The conduit obviously may be provided with any suitable deflector which will direct a jet or blast of air against the side of the drill steel.

In operation the drill steel 6 is rapidly struck by ,means of the piston 2 and anvil blockll and slowly rotated bymeans of the mechanism described above, and with each reciprocation of the hammer, part :of the motive fluid exhausted from cylinder 1 through port 12 is brought forward ofthe drill through conduit 13 and confined and deflected by means of the deflector lll, to form a cross current across and around the drill steel 6, in front of the operative parts of the tool and discharged from the side of the tool outwardly away from the hole being drilled and substantially at rightangles to the axis of the tool. The force with which this motive 'fluid or air impinges against the sides of the rotated drill steel, is sufficient to sweep away any of the cuttings or water which may flow down the drill steel 6 from the cutting end ofthe drill steel, thus preventing any of this water or cuttings rfrom entering the space between the drill steel 6 and chuck 5 and interfering with and wearing away the parts of chuck 5 and Ycylinder 1.

It is to be understood that the present showing and description discloses only certain specific embodiments of the present invention and that other forms and modifications are included within the spirit and scope of the invention as expressed in the appended claims.

What I claim isz- 1. In a fluid operated percussive tool, `a tool lcasing having a front head, a piston reciprocating therein, means for holding a drill steel at the front end of the tool, a conduit in the walls of the tool casing and front head leading to a point at the front end of the tool for conducting motive fluid, said conduit being turned at right angles in the front head at its front end in order to discharge the motive fluid across the face of the tool'substantially at right angles thereto, and means for confining and deflecti-n-g the stream 'to fori-n across'current around-the shank of the steel in front of the Aoperative parts of the tool and discharged from the side of the tool outwardly away from the hole being drilled, thereby preventing detritus and water from entering the said parts of the tool.

2. In a fluid operated percussive tool, a tool casing having a front head, a piston reciprocating therein, .means for holding a drill steel at the front end of .the tool, a conduit in the walls of the tool .easing and front head leading to a point at the front end. of the tool for conducting motive fluid, said conduit being turned at right angles in the front .head at its front end in order to discharge the motive fluid across the face of the ytool substantially `at right angles thereto, and anarc shaped deflector open at a point diametrically Vopposite the end of the saidconduit for conningand deflecting the stream to 4form .a cross current around the shank of the steel in front ofthe operative parts of the tool and discharged from the side of the tool outwardly away from the hole being drilled, thereby .preventing detritus .and water yfrom entering the said parts of the tool.

3. In a fluid operated percussive tool, atool casing having a front head,a piston reciprocating therein, means for holding adrill steel in the front end of the tool, a conduit in the walls of the tool casing and front head leading to a point `at the front end of the tool for conducting motive fluid, said conduit being turned at right angles in the front head in its front end in order to discharge the motive fluid across `the face of the tool substantially at right angles thereto, and means for confining and deflecting the stream to form a cross current around the shank of the steel in front ofthe operative parts of the tool and discharged from the side of the tool outwardly in a direction substantially at right angles to the aXisof1 the tool, thereby preventing detritus and water from entering the said parts of the tool.

In testimonywhereof, I .have hereunto Vset my hand.

HARRY v. HAIGHT. 

